KR20240012636A - Web-open type steel plate, bridge and construction method therewith - Google Patents

Abstract

Both end extension sections (L1) are formed of both end steel plates with upper and lower flanges and a web (web), and the central extension section (L2, L=2*L1+L2) excluding both end extension sections (L1) ), a steel plate with an economical open belly that can be manufactured quickly by forming only vertical steel members spaced apart from each other in the longitudinal direction, without forming a web on the upper and lower flanges, a bridge manufactured using the same, and a construction method are disclosed. In the steel plate with an open abdomen, both end extension sections (L1) of the entire extension length (L) include both end steel plates having an upper flange, a lower flange, and an abdomen; And in the central extension section (L2, L=2*L1+L2) excluding the two end extension sections (L1), no abdominal area is formed on the upper flange and the lower flange, and only vertical steel members are installed spaced apart from each other in the longitudinal direction. .

Description

Steel plate with open belly, bridge manufactured using it, and its construction method {WEB-OPEN TYPE STEEL PLATE, BRIDGE AND CONSTRUCTION METHOD THEREWITH}

The present invention relates to a steel plate with an open abdomen. More specifically, both end extension sections (L1) are formed of both end steel plates with upper and lower flanges and a web (web), and the central extension section (L2, L=2*) excluding both end extension sections (L1) In L1+L2), it is possible to manufacture quickly by forming only vertical steel members spaced apart from each other in the longitudinal direction without forming a web on the upper and lower flanges, so it is an economical steel plate with an open web, and bridges and construction made using it. It's about method.

Figure 1a shows an example of a conventional concrete girder 10 with an open abdomen.

It can be seen that the concrete girder 10 with the open abdomen includes an upper flange 11, a vertical abdomen 13, and a lower flange 12.

At this time, it can be seen that in the case of the upper flange 11, the tension member 14 is placed inside in the longitudinal direction to introduce additional prestress.

In addition, it can be seen that the vertical abdomen 13 is in the form of a vertical steel pipe and is arranged in a plurality spaced apart in the longitudinal direction between the upper and lower sides of the upper and lower flanges 11 and 12.

That is, the upper and lower flanges 11 and 12 are made of concrete horizontal plate members, and the vertical abdomen 13 is made of steel,

The upper and lower plates (15, 16) are integrated on the upper and lower surfaces of the vertical abdomen (13) made of steel,

It can be seen that the method of fixing the top and bottom plates 15 and 16 to the bottom and top of the upper flange 11 and lower flange 12, respectively, with fasteners 17 such as anchor bolts is adopted. .

Accordingly, by using the vertical abdomen (13), the space between the vertical abdomen (13) is formed as an empty space (S), making it possible to reduce the self-weight of the concrete girder with an open abdomen, and the vertical abdomen (13) is connected to the vertical steel pipe. It can be seen that it can effectively resist twisting, buckling, and shear forces.

However, due to a recent shortage of skilled workers, the upper and lower flanges (11, 12) are made of concrete and the vertical abdomen (13) is made of steel, and then the vertical abdomen (13) is fastened to the upper and lower flanges (11, 12). The limitation of this method of fixation is that the construction type is somewhat complicated.

Figure 1b shows another example of a conventional concrete girder 20 with an open abdomen.

That is, compared to Figure 1a, the upper and lower flanges 21 and 22 are made of concrete horizontal plate members, the vertical abdomen 23 is made of steel, and the top and bottom of the vertical abdomen 23 made of steel are It can be seen that it is integrated using the inserted acupressure support plate 24.

This acupressure support plate 24 is designed to allow the vertical abdomen 23 to be simply inserted and fixed so that it is not otherwise rigid to the upper and lower flanges 21 and 22.

Accordingly, it can be seen that a fall prevention member 25 formed of, for example, a type of concrete concrete is formed at the ends of the upper and lower flanges 21 and 22.

In other words, the fall prevention member 25 functions to restrain the upper and lower flanges at both ends because the vertical abdomen 23 is not rigid to the upper and lower flanges and the vertical abdomen 23 may fall due to bending moment. will have

Accordingly, in the case of Figure 1b, the vertical abdomen 23 can be installed using a steel pipe, but the upper and lower flanges are also manufactured in the form of a concrete horizontal plate, and concrete pouring work for the fall prevention member 25 is required. In addition, the inconvenience of having to separately manufacture and install the acupressure support plate 24 in advance arises.

Accordingly, in the case of a conventional beam member (girder) manufactured with an open abdomen, the upper and lower flanges (11, 12, 21, and 22) are formed of concrete horizontal plates to effectively resist the compressive force due to the applied load, and the lower flange is subject to prestress. Since the introduction is possible and the vertical abdomen (13, 23) mainly resists shear force, it can be seen that steel materials such as steel pipes can be used for the upper and lower flanges.

Since concrete and steel are heterogeneous materials, it can be seen that separate connecting means such as fasteners and acupressure support plates are used to integrate each other. Even if it is factory manufactured, the amount of work increases, which actually increases labor costs. A problem arises due to limitations due to the large number of factors.

Republic of Korea Patent No. 10-1286116 (Title of invention: Composite girder using vertical steel pipe as a web material and bridge construction method using the same, Publication date: June 21, 2013) Republic of Korea Patent Publication No. 10-2018-0126939 (Title of invention: Composite girder using filled steel pipe as an abdominal member and connected by tension with steel wire, Publication date: November 28, 2018)

Accordingly, in consideration of manufacturing and construction, the present invention has the upper and lower flanges and abdomen of both end extension sections (L1) made of steel in a steel plate with an open abdomen having a total extension length (L), so that the material In order to solve the problem of integration due to heterogeneity, in the central extension section (L2, L=2*L1+L2) excluding the extension sections at both ends (L1), no abdomen is formed on the upper and lower flanges, and the The technical problem is to provide an economical steel plate with an open belly, a bridge manufactured using it, and a construction method by making it possible to manufacture it quickly and simply by forming only vertical steel members spaced apart from each other in the direction.

In addition, the technical task is to provide a steel plate with an open abdomen that is easy to manufacture and construct, bridges manufactured using it, and construction methods in line with recent production conditions due to the recent shortage of skilled workers and the enforcement of the domestic Serious Accident Punishment Act. .

In order to achieve the above problem, the steel plate with an open abdomen of the present invention, the bridge manufactured using the same, and the construction method are, in the overall extension length (L), the extension sections (L1) at both ends include the upper flange, the lower flange, and the abdomen. Both end steel plates provided; And in the central extension section (L2, L=2*L1+L2) excluding the two end extension sections (L1), no abdominal area is formed on the upper flange and the lower flange, and only vertical steel members are installed spaced apart from each other in the longitudinal direction. A steel plate with an open abdomen is provided.

According to the present invention, both ends are formed with steel plates at both ends of I-shaped cross section, and between the steel plate girders at both ends, the abdomen is formed only with vertical steel between the upper and lower flanges, and they are simply integrated with a minimum of welding. Depending on the order, it can be manufactured with a minimum of manpower, and compared to the production of existing steel plate girders, the amount of welding is reduced, reducing carbon emissions, making it environmentally friendly and economical. Provides steel plates with an open belly, bridges manufactured using them, and construction methods. This becomes possible.

In addition, in the present invention, since both end steel plates and vertical steel of the I-shaped cross section are made of steel, initial setting is possible using a magnetic jig, and integration by welding (simple fillet welding) can be performed even by unskilled personnel. It becomes possible to provide a steel plate with an open belly that can be manufactured, a bridge manufactured using it, and a construction method.

In addition, the present invention not only enables reinforcement of a steel plate with an open abdomen by additionally installing vertical steel members on a steel plate with an open abdomen, but also has a structure that is as easy to understand and simple as possible, thereby solving the problems caused by the recent shortage of skilled workers. It is advantageous for construction and maintenance because it is easy to understand production and construction according to the trend of the times.

Figure 1a is an example of a concrete girder with a conventional open abdomen;
Figure 1b is another example of a concrete girder with a conventional open abdomen;
2A and 2B are illustrations of a steel plate with an open abdomen of the present invention;
Figure 2c is an illustration of integration by a steel plate and jig with an open abdomen of the present invention,
Figures 3a and 3b show examples of a bridge manufactured using a steel plate with an open belly of the present invention and a construction method.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part "includes" a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

[Steel plate (100) with open abdomen of the present invention]

Figures 2a and 2b are illustrations of a steel plate 100 with an open abdomen of the present invention, and Figure 2c is an illustration of integration by a steel plate 100 with an open abdomen and a jig 200 of the present invention. will be.

Referring to Figures 2a and 2b, based on the overall extension length (L) of the steel plate 100 with an open abdomen, both end extension sections (L1) are both end steels having upper and lower flanges and abdomen (web). It is formed with plates 110 and 120, and in the central extension section (L2, L=2*L1+L2) excluding the extension sections at both ends (L1), only the vertical steel member 130 is formed without forming the abdomen on the upper and lower flanges. do.

At this time, the open abdomen of the steel plate 100 having an open abdomen is installed with vertical steel members 130 spaced apart from each other in the longitudinal direction between both end steel plates 110 and 120, and the central extension section (L2, L = 2) *This means that the space between the vertical steel members 130 in L1+L2) is open as an empty space (S).

In addition, since both end steel plates 110, 120 and the vertical steel material 130, which constitute the steel plate 100 with an open abdomen, are made of steel, they are not heterogeneous materials but are simply welded to each other, so there is a problem in integration. It is ensured that there is no

In addition, the vertical steel material 130 is set at a distance from each other at the top and bottom of the upper and lower flanges, which are also made of steel, and then is integrated. After initial setting using a magnetic jig 200 for position setting, Since the jig 200 can be removed after being integrated by welding, rapid manufacturing is possible even without skilled manpower when manufacturing in a factory.

In addition, the vertical steel 130 is also provided with a connecting protrusion 140 so that both ends of the crossbeam 340 can be connected, as shown in Figure 2c, to maximize the advantage of using the steel plate 100 with an open abdomen. It becomes possible.

The steel plate 100 with such an open abdomen is used as a girder for a temporary bridge, for example, and is advantageous for demolition and dismantling, especially during heavy rain. The effect of wind load is minimized during construction and public use (minimization of strength due to wind load), thereby ensuring structural safety. You will be able to secure enough.

In addition, the steel plate 100 with an open abdomen installs only vertical steel members 130 in the central extension section (L2, L=2*L1+L2) excluding the end extension section (L1), so it can be installed in a straight or curved shape. Manufacturing becomes very easy.

For this purpose, the steel plate 100 with an open abdomen of the present invention includes both end steel plates 110 and 120, a vertical steel member 130, a connecting protrusion 140, and an end block 150, as shown in FIGS. 2A, 2B and 2C. ) is formed to include.

First, the both end steel plates 110 and 120 include an upper flange 111 and 121, an abdomen 113 and 123, and a lower flange 112 and 122, as shown in FIGS. 2A, 2B and 2C, and a steel plate 100 with an open abdomen. ), and is a steel material formed with an I-shaped cross section.

Accordingly, the upper flanges 111 and 121 are formed as horizontal steel plates over the entire extended length (L) of the steel plate 100 with an open abdomen, as shown in FIGS. 2A, 2B and 2C, and have a straight open abdomen. When manufacturing the strong steel plate 100, it is manufactured in the form of a straight horizontal plate, but when manufacturing it in a curved shape, it is formed as a curved horizontal plate.

The lower flanges (112, 122) are set to be horizontally spaced downward from the upper flanges (111, 121), as shown in FIGS. 2A, 2B, and 2C, and extend over the entire extended length (L) of the steel plate 100, which also has an open abdomen. It is formed as a steel horizontal plate. When manufacturing the steel plate 100 with a straight open abdomen in response to the upper flanges 111 and 121, it is manufactured in the form of a straight horizontal plate, but when manufacturing it in a curved shape, it is manufactured in the form of a curved plate. It is formed into a horizontal plate.

The abdomen 113 and 123 are vertical plates so that the vertical plates are continuous from both end surfaces of the steel plate 100 having an open abdomen to a position spaced apart from the center (from both end surfaces to the end of L1), as shown in FIGS. 2A, 2B and 2C. When manufacturing the steel plate 100 with a straight open abdomen corresponding to the upper flanges 111 and 121 and the lower flanges 112 and 122, it is manufactured in the form of a straight vertical plate, but when manufactured in a curved form, It is formed from a curved vertical plate.

Accordingly, it can be seen that the upper flanges (111, 121) and lower flanges (112, 122), which are horizontal steel plates, and the abdomen (113, 123), which are vertical plates, are integrally formed with an I-shaped cross section (transverse cross section), and the upper flanges (111, 121) and the abdomen (113, 123) are vertical plates. (113,123), the lower flanges (112,122) can be manufactured by processing steel plates using a built-up method, for example, and then integrated by welding.

Since these two end steel plates (110, 120) are installed to be supported at (continuous) points such as piers and abutments in the bridge, a large bending moment and shear force are generated, so they are formed into the upper and lower flanges and the abdomen, but are not welded. It is integrated to ensure sufficient rigidity according to the applied load.

Next, as shown in FIGS. 2A, 2B and 2C, the vertical steel material 130 is formed in a central extension section (L2, L=2*) excluding both end extension sections (L1) where both end steel plates 110 and 120 are formed. These are vertically installed steel materials that are installed longitudinally apart from each other (L1+L2).

The same steel material as both end steel plates 110 and 120 is used, and steel bars, steel pipes, and channel members can be used. The present invention will be examined based on the case of using a vertical steel pipe.

Since the vertical steel material 130 is also made of steel, it is integrated and spaced apart from each other in the central extension section (L2, L=2*L1+L2) of both end steel plates 110 and 120 made of the same steel material.

Welding is used as an integration method. Welding is a proven means for integrating steel materials with each other, and because work by a welder is possible, that is, as shown in FIGS. 1A and 1B, separate top and bottom plates (15, 16) ), since there is no need to use the acupressure support plate 23, it is possible to solve problems caused by the complexity of the construction type.

At this time, the spacing of the vertical steel members 130 located in the central extension section (L2) is such that the steel plate 100 with an open abdomen is close to both end steel plates 110 and 120 supported by being mounted on the branch portion of the bridge. It is made narrow compared to the gap in the center,

Furthermore, in cases where additional reinforcement is required during public use, additional vertical steel members can be installed between the vertical steel members 130, and this can be easily installed by using the jig 200, which will be described later.

Since these vertical steel members 130 are installed vertically on the straight or curved upper flanges 111,121 and lower flanges 112,122, they can be easily integrated, and the central extension section (L2, L=2*L1+L2) Since the bending moment and shear force do not occur significantly compared to the extension section at both ends (L1), it is possible to secure structural safety simply by installing the vertical steel 130 without the abdominal area 113, 123.

In addition, in the case of FIGS. 2A and 2B, one row is installed in the longitudinal direction, but it can be formed with one or more rows of vertical steel members 130.

In addition, as shown in FIGS. 2A, 2B, and 2C, the connecting protrusion 140 is in the form of a block that protrudes horizontally in the approximate middle of the vertical steel material 130 seen above, and is a portion that connects both ends of the cross beam 340. .

When using the steel plate 100 with an open abdomen as a girder of a bridge, the crossbeam 340 is arranged in a plurality of transverse directions when installing a plurality of steel plates 100 with an open abdomen in the transverse direction of the bridge. This is to restrain the steel plates 100 with an open abdomen to each other in the transverse direction.

This crossbeam 340 is also installed using steel. It can be installed horizontally or in a bracing form, and is simply welded and mechanically fastened to the connection protrusion 140 formed on the vertical steel 130 of the present invention. It is made to be connected.

Accordingly, the connecting protrusion 140, like the crossbeam 340 in the form of a steel pipe, is installed so that the ends are inserted into each other and welded to maintain the consistency of the steel welding process, thereby enabling rapid and efficient bridge construction. Able to know.

Next, the end block 150 can be additionally installed on the abdomen 113 and 123 of both end steel plates 110 and 120, as shown in FIG. 2A.

In particular, when using the steel plate 100 with an open abdomen according to the present invention as a curved girder, it is possible to resist buckling and twisting by more effectively restraining both ends under construction loads occurring during transportation and construction after manufacturing. It will be so.

This end block 150 is in the form of a rectangular box 151 made of concrete and steel and is simply anchored to the abdomen 113 and 123 of both end steel plates 110 and 120 through fastening holes h formed in the abdomen 113 and 123. Installation and disassembly can be made using fasteners 152 such as bolts.

That is, during bridge construction, there is no need for the end blocks 150 to remain after mounting the steel plate 100 with an open abdomen, so the fastener 152 can be dismantled and removed for reuse.

It is natural that these end blocks 150 can also be applied in the same way as the steel plate 100 with an open abdomen manufactured in a straight or curved shape.

Next, the jig 200 takes advantage of the advantages that arise because both end steel plates 110 and 120 and the vertical steel material 130 are manufactured from steel, as shown in FIG. 2b.

The vertical steel material 130 uses a steel pipe, etc., and since it must be installed spaced apart between the bottom and top surfaces of the end steel plates 110 and 120 as if it were a horizontal steel plate, the position must first be marked during the manufacturing process and then welded. , problems such as displacement may occur during such welding work,

The vertical steel material (130) is fabricated in a plurality of semicircular shapes, etc., and is placed on the bottom and upper surfaces of the upper flanges (111, 121) and lower flanges (112, 122) of the vertical steel material (130) using a block-shaped jig (200) with magnetic properties. This allows for simple initial setup.

Accordingly, after the both end steel plates 110 and 120 and the vertical steel 130 are integrated by welding the vertical steel 130, they can be easily removed by manpower and reused.

[Bridge 300 manufactured using the steel plate 100 with an open belly of the present invention and its construction method]

Figures 3a and 3b show an example of a bridge 300 and a construction method manufactured using the steel plate 100 with an open abdomen of the present invention.

That is, it shows a method of constructing a bridge using the steel plate 100 with an open belly of the present invention as a bridge girder and a bridge manufactured using the steel plate 100 with an open belly of the present invention. 3A and 3B.

Accordingly, according to Figure 3a, the bridge substructures 310 and 320 are constructed, and the steel plate 100 with an open abdomen of the present invention is manufactured and installed.

The bridge substructures 310 and 320 refer to abutments and piers in a continuous bridge and are constructed in the form of vertical walls, and a bridge support 330 is usually installed on the upper surface.

Separately, a steel plate 100 and a crossbeam 340 with an open abdomen of the present invention are prepared.

Referring to FIG. 2A, it can be seen that the steel plate 100 having the open abdomen is formed to include both end steel plates 110 and 120, a vertical steel member 130, and a connecting protrusion 140.

At this time, referring to Figure 2a, the end block 150 can be used for transportation and mounting after manufacturing the steel plate 100 with an open abdomen and finally removed. This is especially a curved steel plate with an open abdomen ( It is effective when manufacturing 100), but it can be used even when a steel plate 100 with a straight open abdomen is manufactured with a long span.

Accordingly, the steel plate 100 with an open abdomen is made of both end steel plates 110 and 120 and vertical steel materials 130, and the both end steel plates 110 and 120 are formed with an I-shaped cross section, and the vertical steel materials 110 and 120 are made of steel. It can be seen that (130) is designed to be formed as a vertical steel pipe.

The crossbeam 340 can be made of a steel pipe. The crossbeam 340 is used to restrain the steel plate 100 with an open abdomen in the transverse direction after mounting it, but the connection protrusion formed on the vertical steel material 130 You can connect and install using (140).

In the case of a curved bridge, it can be seen that it has a constant curvature in the longitudinal direction, and the steel plate 100 with an open belly is mounted in the transverse direction and is constructed so that it is restrained by the cross beam 340.

Next, according to Figure 3b, the steel plate 100 with an open abdomen of the present invention mounted on the bridge substructures 310 and 320 is restrained in the transverse direction using a cross beam 340, and a slab 350 is constructed. The bridge is completed.

The steel plate 100 with the open abdomen is mounted so that both ends are supported by bridge supports 330 between abutments and piers,

The steel plate 100 having the mounted open abdomen is installed to be restrained by a cross beam 340 in the transverse direction. That is, the steel plates 100 having an open abdomen on the connecting protrusions 140 are constrained to each other in the transverse direction by the cross beams 340 installed in the transverse direction.

The slab 350 can be constructed, for example, by installing a temporary bridge deck on the upper surface of a steel plate 100 with an open abdomen and then pouring slab concrete.

Both ends of the steel plate 100 with an open abdomen mounted thereon are located at the branch portion of the continuous bridge, and the bending moment and shear force acting on the branch portion can be sufficiently resisted by the both end steel plates 110 and 120. , the bending positive moment and shear force at the center can be easily resisted even if an empty space (S) is formed by the vertical steel members 130 installed on both end steel plates 110 and 120.

Both ends of the both end steel plates 110 and 120 in the longitudinal direction of the bridge can be simply connected by welding or splice.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: Steel plate with open abdomen
110,120; Both end steel plates
111,121: upper flange 112,122: lower flange
113,123: Abdomen (web)
130: vertical steel 140: connection protrusion
150: End block
151: rectangular box 152: fastener
200: Jig
300: Bridge manufactured using steel plates with an open abdomen
310,320: Bridge substructure
330: Bridge support 340: Crossbeam
350: slab
h: fastening hole
L: Total extended length of steel plate with open abdomen
L1: End extension section L2: Center extension section
S: empty space

Claims (10)

In the entire extension length (L), both end extension sections (L1) include both end steel plates (110,120) having upper flanges (111,121), lower flanges (112,122), and abdomen (113,123); and
In the central extension section (L2, L=2*L1+L2) excluding the extension sections at both ends (L1), no abdomen is formed in the upper flange (111, 121) and the lower flange (112, 122), and the vertical sections are spaced apart from each other in the longitudinal direction. A steel plate with an open abdomen so that only the steel material 130 is formed. According to paragraph 1,
The vertical steel 130 is,
It includes a steel pipe whose upper and lower parts are integrated by welding on the bottom and upper surfaces of the upper flanges (111, 121) and lower flanges (112, 122),
The spacing of the vertical steel members 130 located in the central extension section (L2) is in the central part of the steel plate 100 with an open abdomen at a position close to both end steel plates 110 and 120 supported by being mounted on the branch portion of the bridge. A steel plate with an open abdomen that is narrow compared to the spacing. According to claim 1 or 2,
The upper flanges (111,121) and lower flanges (112,122) of the both end steel plates (110,120) are formed as straight or curved horizontal plates, and the abdomen (113,123) is at both ends of the upper flanges (111,121) and lower flanges (112,122). The vertical plates are formed continuously from the side surface to the central part (from both end surfaces to the end of L1), and are formed as straight or curved vertical plates corresponding to the upper flanges (111, 121) and lower flanges (112, 122).
A steel plate with an open abdomen in which the upper flanges (111, 121), lower flanges (112, 122) and vertical plate abdomen (113, 123) are integrally formed with an I-shaped cross section. According to claim 1 or 2,
A steel plate with an open abdomen further forming a connecting protrusion 140 that connects both ends of the crossbeam 340 in the form of a block that protrudes horizontally in the middle of the vertical steel 130. According to claim 1 or 2,
An end block 150 is additionally installed on the abdomen 113 and 123 of the both end steel plates 110 and 120, and the end block 150 is in the form of a rectangular box 151 made of concrete and steel, and the abdomen 113 and 123 A steel plate with an open abdomen that allows installation and disassembly using fasteners 152 on the abdomen (113, 123) of both end steel plates (110, 120) through fastening holes (h) formed in. According to paragraph 1,
Using a magnetic block-shaped jig 200, the vertical steel 130 is initially set on the bottom and upper surfaces of the upper flanges 111 and 121 and the lower flanges 112 and 122 of the vertical steel 130, respectively. A steel plate with an open abdomen that allows the jig 200 to be removed and reused after the both end steel plates 110, 120 and the vertical steel material 130 are integrated by welding. In the entire extension length (L), both end extension sections (L1) include both end steel plates (110,120) having upper flanges (111,121), lower flanges (112,122), and abdomen (113,123); And in the central extension section (L2, L=2*L1+L2) excluding the extension sections at both ends (L1), the upper flange (111,121) and the lower flange (112,122) do not form a belly, but are spaced apart from each other in the longitudinal direction. A steel plate (100) having an open abdomen so that only the vertical steel material (130) is formed, and the upper flanges (111, 121), lower flanges (112, 122) and vertical plate abdomen (113, 123) are integrally formed with an I-shaped cross section. ; and
A bridge manufactured using a steel plate with an open abdomen, including a bridge substructure (310,320) in which the steel plate (100) with an open abdomen is supported by a bridge support (330). (a) In the entire extension length (L), both end extension sections (L1) include both end steel plates (110,120) having upper flanges (111,121), lower flanges (112,122), and abdomen (113,123); And in the central extension section (L2, L=2*L1+L2) excluding the extension sections at both ends (L1), the upper flange (111,121) and the lower flange (112,122) do not form a belly, but are spaced apart from each other in the longitudinal direction. A steel plate (100) having an open abdomen so that only the vertical steel material (130) is formed, and the upper flanges (111, 121), lower flanges (112, 122) and vertical plate abdomen (113, 123) are integrally formed with an I-shaped cross section. producing a; and
(b) constructing a bridge substructure (310,320) in which the steel plate (100) having an open abdomen is supported by a bridge support (330);
(c) Both ends of the cross beam 340 installed in the transverse direction between the steel plates 100 with an open abdomen are connected to the connection protrusion 140 formed in the form of a block that protrudes horizontally in the middle of the vertical steel material 130. A bridge construction method manufactured using a steel plate (100) with an open abdomen, including the step of ensuring that the steel plate (100) with an open abdomen is restrained in the transverse direction. According to clause 8,
The upper flanges (111,121) and lower flanges (112,122) of both end steel plates (110,120) in step (a) are formed as straight or curved horizontal plates, and the abdomen (113,123) is a steel plate (100) with an open abdomen. Vertical plates are formed continuously from both end surfaces to a position spaced apart from the center (from both end surfaces to the end of L1),
The upper flanges (111,121) and the lower flanges (112,122) are formed of straight or curved vertical plates, so that the upper flanges (111,121), the lower flanges (112,122) and the vertical plates (113,123) have an I-shaped cross section. A bridge construction method manufactured using a steel plate (100) with an open belly to be formed as one piece. According to clause 8,
In step (a), end blocks 150 are further installed on the abdomen 113 and 123 of both end steel plates 110 and 120, and the end blocks 150 are in the form of a rectangular box 151 made of concrete and steel. It is installed using a fastener (152) on the abdomen (113, 123) of both end steel plates (110, 120) through fastening holes (h) formed in the abdomen (113, 123), and can be dismantled after step (c). ,
The vertical steel material 130 in step (a) is formed on the bottom and upper surfaces of the upper flanges 111, 121 and lower flanges 112, 122 of the vertical steel material 130 using a magnetic block-shaped jig 200 ( 130) is initially set, but after the both end steel plates 110,120 and the vertical steel material 130 are integrated by welding the vertical steel material 130, the jig 200 is removed to create an open abdomen that can be reused. Bridge construction method manufactured using a strong steel plate (100).